A priest has been arrested on charges of stalking late-night talk show host Conan O'Brien by writing him threatening notes on parish letterhead, contacting his parents and showing up at his studio, prosecutors said. The Rev. David Ajemian, a priest in the Archdiocese of Boston, was arrested last week while trying to enter a taping session of NBC's "Late Night with Conan O'Brien" at New York's Rockefeller Plaza, Barbara Thompson, a spokeswoman for the Manhattan prosecutor's office, said Wednesday. Ajemian referred to himself as "your priest stalker" in one note and complained of not being allowed in to see an earlier taping of the O'Brien show, court papers say. "Is this the way you treat your most dangerous fans?" the note said.